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《Chinese Journal of Geophysics》 1982-05
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A MAGNETOTELLURIC STUDY OF THE EARTH'S CRUST ANDUPPER MANTLE ALONG A LINE FROM NAGQU TOYADONG IN XIZANG PLATEAU

REN AI-HUA SHI YING-JUN LI ZONG-SHUN LI HONG-ZHENGYANG ZHONG-WU HUANG BO-MIN CHEN GUANG-MING(Institute of Geophysics, Academia Sinica)  
Magnetotelluric measurements were carried out in Xizang plateau during June-September, 1977 by use of home-made equipment. The results of measurements and their interpretations are presented.Five sites along a line of over 500 km across the strike direction of the geological structure are chosen for MT measurements. From north to south they are Nagqu, Quxu, Gyangze, Pagri and Yadong.The data for each site are processed by the method of the tensor impedance estimates and various parameters are calculated. They are azimuths of the principal impedance axes, principal impedance, apparent resistivities parallel and perpendicular to the strike, ellipticity factors and so on. By using Marquardt method, a one-dimensional inversion is made. A five-layer model of the conductivity distribution is derived for the five sites. From this model, we obtain the following conclusions:1. The total thickness of the upper four layer at Nagqu, Qiixii, Gyangze, Pagri and Yadong are 66, 65, 62, 57 and 50 km respectively. They approximately agree with other geophysical results if they are taken to be the thickness of the earth's crust.2. The tendency of the conductivity distribution at the five sites is in good accord. They all belong to low-high-low type.3. There is a low resistivity zone in the earth's crust at investigated sites, the depth of which is about 10 to 20 km.4. There are marked differences in variations of conductivity structures in the regions situated to two sides of the Yarlung Zangbo River. The variations in the northern region are gentle, but sharp in the southern one.5. The depth of the surface sedimentary complex is about four kilometers.
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